Most Complex Script Ever. just a little push -help comment this script

hello, here is a script that was written to connect with a desktop java application. ---its a script that sends request from the desktop application to the web server and transfer the results back to the desktop application. it is a sort of relay script. please i need explanation that will help understand what the script is actually doing and how it works. any resource on php desktop applications connections would be of help.

I commented out what I could make out of the script below. What this script does is forward the post and get parameters to the server, and outputs the results.